CN1773895A - A base station and a scrambling code setting method - Google Patents

A base station and a scrambling code setting method Download PDF

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Publication number
CN1773895A
CN1773895A CNA2005101152252A CN200510115225A CN1773895A CN 1773895 A CN1773895 A CN 1773895A CN A2005101152252 A CNA2005101152252 A CN A2005101152252A CN 200510115225 A CN200510115225 A CN 200510115225A CN 1773895 A CN1773895 A CN 1773895A
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China
Prior art keywords
base station
scrambler
station
scrambling code
mobile radio
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CNA2005101152252A
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CN1773895B (en
Inventor
森慎一
冈岛一郎
梅田成视
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NTT Docomo Inc
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NTT Docomo Inc
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Publication of CN1773895A publication Critical patent/CN1773895A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0466—Wireless resource allocation based on the type of the allocated resource the resource being a scrambling code
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a base station, a mobile communication system and a scrambling code setting method capable of automatically setting a scrambling code that a base station should use. This base station is provided with a scrambling code setting means for setting a base station identifier and a tentative down-scrambling code that is tentatively assigned and a transmitting means for distributing and transmitting the base station identifier by the tentative down-scrambling code, wherein the scrambling code setting means determines a permanent down-scrambling code on the basis of a reception report of the base station identifier.

Description

Base station and scrambling code setting method
Technical field
The present invention relates to by base station and mobile communication system and the scrambling code setting method of code division multiple access connected mode in the CDMA Cellular System of shared among users use identical frequency band.
Background technology
For the communication system of employing code division multiple access connected mode shared identical frequency band in a plurality of communication ripples, each ripple of communicating by letter is by distinguishing as the spreading code of random code sequence.The detection characteristic (autocorrelation performance) of spreading code is just high more with the good more system effectiveness of evident characteristics (their cross correlation) between different spreading codes.Therefore, do not use all random code combinations of determining by sequence length, but select to use can obtain need the sign indicating number sequence of characteristic.Therefore, spreading code is restricted under the situation of high system effectiveness requiring, and assignable spread spectrum yardage is less than whole wave numbers of communicating by letter simultaneously of system's supposition.
Particularly for the spreading code that in the downgoing line of W-CDMA cellular system, uses, except high detection characteristic and evident characteristics, even in order also to realize high-quality communication under low transmitted power condition, also requirement can reduce the sign indicating number orthogonality of the phase mutual interference between different spreading codes.Therefore, assignable spread spectrum yardage is lacked than uplink.In order effectively to utilize this less spreading code, in all sub-districts, it is reused, but in order to prevent the interference of minizone, the different sign indicating number of overlapping use in each sub-district.
In the W-CDMA cellular system, reality is called channel code to the spreading code that user data carries out wide-band spread spectrum, the sign indicating number that presence of intercell interference is used that prevents overlapping in each sub-district is called scrambler.
The scrambler number that is used to distinguish the sub-district neither be unlimited, only stipulated 512 kinds in the W-CDMA cellular system, must not be set at closely in use with a kind of scrambler in order to prevent to disturb.In the past, the position by having set the base station or the Computer Simulation of device/antenna structure, estimate the arrival zone of electric wave at each base station, wireless network designer is manually set in the support of accepting computer, makes to arrive between the regional equitant base station not to be configured to a kind of scrambler.Therefore, will newly be provided with along with the increase of traffic carrying capacity under the situation of base station, the designer must implement to set once more.
In addition,, therefore between the arrival zone of actual field and electric wave, taken place between with a kind of scrambler, to disturb under the situation of error, must revise and set because set scrambler according to the estimation of Computer Simulation.Therefore, expensive time, designer's labour and on-the-spot affirmant's time wanted in these operations.
In order to address this problem, announced the method (for example with reference to patent documentation 1) of the descending scrambler that uses in automatically definite base station.In the method, at first the base station by the W-CDMA cellular system receives the downgoing line wireless signal that peripheral base station sent and determines that its control channel carries out demodulation, thereby differentiates the descending scrambler that has used in peripheral base station.Base-station control apparatus is according to the definite automatically descending scrambler that will use in this base station of this differentiation result.
In the method, it is characterized in that in the base station, receiving downgoing line.The control channel of the filter be used to receive downstream bands, receiver demodulation section, downgoing line is specified in the base station, and has the handling part that is used to differentiate scrambler or channel code.Base-station control apparatus is set than the descending scrambler by the more high-order numbering of the descending scrambler that has used in peripheral base station that the base station determined.Like this, between adjacent base station, can not set with a kind of descending scrambler.
[patent documentation 1] TOHKEMY 2002-218528 communique
Yet, have following problem in the above-mentioned background technology.
Automatically determining that the problem of existence is in the method for descending scrambler: the receiver and the filter that in the base station, need to be used for to determine the control channel of the downgoing line that sends from peripheral base station.The receive frequency of the common uplink receiver that the base station possessed and the frequency of downgoing line are separated by more than tens MHz, so must make oscillator or amplifier, receiving filter etc. corresponding to two frequencies, make the scale of receiver increase.
In addition because in the up-downgoing circuit frame structure of control channel, different at in-phase channel (Ich) and the multiplexing method of orthogonal channel (Qch), employed scrambler, so the problem that exists the scale that makes device or software to increase.
In addition, the powerful interference source the when down link signal that this base station sent becomes the downgoing line that receives peripheral base station comes it such as is isolated at countermeasure so transmitting antenna and reception antenna need be set respectively, has the problem that the antenna scale is increased.
Secondly, determining automatically in the method for descending scrambler, having the problem that does not have to consider to have the peripheral cell tabulation (neighbor list) of very dark relevance with the setting of descending scrambler.
Tabulating the employed descending scrambler of its peripheral base station in each base station as peripheral cell, uses control channel to circulate a notice of, so that make mobile radio station can carry out cell detection at high speed.When being the descending scrambler of certain base station assigns, not only to avoiding being chosen in the descending scrambler that uses in the adjacent base station of this base station, but also can not be chosen in the descending scrambler of being put down in writing in the peripheral cell tabulation of adjacent base station.This is because the mobile radio station that belongs to the formed sub-district of adjacent base station instantly observes different 2 during with a kind of descending scrambler of base station identifiers simultaneously, can not correctly distinguish 2 base stations that send these descending scramblers.
In addition, determining automatically in the method for descending scrambler, existing the release processing of the descending scrambler that does not comprise when removing the base station and the problem of the update method that peripheral cell is tabulated.Therefore, do not carry out the renewal of peripheral cell tabulation when being removed, the cell detection speed of mobile radio station is reduced in the base station.
Summary of the invention
Therefore, the base station and mobile communication system and the scrambling code setting method that the purpose of this invention is to provide a kind of scrambler that can the automatic setting base station will use.
In order to solve above-mentioned problem, base station of the present invention is the base station in the mobile communication system, the mobile radio station that belongs to down adjacent a plurality of sub-districts in this mobile communication system communicates with the shared identical frequency band in each base station that forms the sub-district, described base station has: the scrambling code setting unit, and it sets base station identifiers and the tentative tentative descending scrambler that distributes; And transmitting element, it utilizes tentative descending scrambler, and base station identifiers is carried out spread spectrum and transmission, and permanent descending scrambler is determined according to the reception report of base station identifiers in the scrambling code setting unit.
By such structure, the automatic setting scrambler that will use suitably, make not can and peripheral cell between produce and disturb.
In addition, mobile communication system of the present invention is the mobile communication system that mobile radio station and the shared identical frequency band in each base station that forms the sub-district of a plurality of sub-districts of belonging to down adjacent communicates, it has: the scrambling code setting unit, and it sets base station identifiers and the tentative tentative descending scrambler that distributes; And transmitting element, it utilizes tentative descending scrambler, and base station identifiers is carried out spread spectrum and transmission, and permanent descending scrambler is determined according to the reception report of base station identifiers in the scrambling code setting unit.
By such structure, the automatic setting scrambler that will use suitably, make not can and peripheral cell between produce and disturb.
In addition, scrambling code setting method of the present invention is the scrambling code setting method in the mobile communication system, the mobile radio station that belongs to down adjacent a plurality of sub-districts in this mobile communication system communicates with the shared identical frequency band in each base station that forms the sub-district, and described scrambling code setting method comprises: the step of setting base station identifiers and the tentative tentative descending scrambler that distributes; Utilize tentative descending scrambler, the step of base station identifiers being carried out spread spectrum and transmission; According to the reception report of base station identifiers, determine the step of permanent descending scrambler; And the step of setting determined scrambler.
By such structure, the automatic setting scrambler that will use suitably, make not can and peripheral cell between produce and disturb.
According to embodiments of the invention, can realize base station and the mobile communication system and the scrambling code setting method of the scrambler that can the automatic setting base station will use.
Description of drawings
Fig. 1 represents according to one embodiment of present invention, the key diagram of the structure of the Radio Access Network when newly establishing the base station.
Fig. 2 is the block diagram of structure of the base station of expression one embodiment of the invention.
Fig. 3 is the block diagram of structure of the base station control station of expression one embodiment of the invention.
Fig. 4 represents according to one embodiment of present invention, the sequence chart of the processing when newly establishing the base station.
Fig. 5 is the key diagram that the peripheral cell tabulation of each base station when beginning is newly established in the expression base station.
Fig. 6 is the key diagram that the expression mobile radio station is measured the situation of report.
Fig. 7 A is the block diagram of structure of the mobile radio station of expression one embodiment of the invention.
Fig. 7 B is that expression is from the key diagram of mobile radio station to the information of base station report.
Fig. 8 is the key diagram of expression to the information of accommodating the base station control station transmission of newly establishing the base station.
Fig. 9 is that expression generates peripheral cell tabulation of newly establishing the base station and the key diagram of determining the processing of scrambler.
Figure 10 represents to establish the key diagram that the peripheral cell list update of base station is handled.
Figure 11 is definite scrambler of expression and the block diagram of upgrading the processing of peripheral cell tabulation.
Figure 12 represents according to one embodiment of present invention, the key diagram of the Radio Access Network when removing the base station.
Figure 13 is the sequence chart of the processing of expression when removing the base station.
Figure 14 is the key diagram of expression to the information of accommodating the base station control station transmission that removes the base station.
Embodiment
Then, with reference to the description of drawings embodiments of the invention.
And at the institute's drawings attached that is used for illustrating embodiment, the part with same function is used prosign, and the repetitive description thereof will be omitted.
The structure example of the Radio Access Network of the embodiment of the invention is described with reference to Fig. 1.
The Radio Access Network of present embodiment is in adjacent a plurality of sub-districts, CDMA (the CodeDivision Multiple Access that the mobile radio station that belongs to the sub-district down and the shared identical frequency band in each base station that forms the sub-district communicate, code division multiple access) cellular system has base station 100 and base station control station 200.For example, has base station 100 1～100 3, base station control station 200 1～200 2, set different scramblers and peripheral cell tabulation at each cell base station.In addition, the Radio Access Network of present embodiment is assumed to the FDD of CDMA (frequency division duplex, Frequency Division Duplexing (FDD)) mode and TDD (Time division duplex, time division duplex) mode.
Each base station 100 1, 100 2With 100 3By base station control station 200 1With 200 2Any one accommodate.In Fig. 1, during beginning, base station 100 1With 100 2By base station control station 200 1 Base station 100 is accommodated by institute 3By base station control station 200 2Institute accommodates.Afterwards, newly established base station 100 4, it is by base station control station 200 1Institute accommodates.
Base station control station 200 1With 200 2Interconnect by the net between base station control station or the upper switch (not shown) of accommodating base station control station.In addition, the peripheral cell tabulation of the base station that base station control station 200 maintenances are accommodated separately can be inquired its content mutually.In addition,, server etc. is set manages, may have visit from base station control station for the project that need in total system, keep uniqueness of base station identifiers etc.
The structure of base station 100 then, is described with reference to Fig. 2.
The base station 100 of present embodiment has: sending part 102, acceptance division 104, the scrambling code setting portion 106 that is connected with acceptance division 104 with sending part 102, the storage part 108 that is connected with scrambling code setting portion 106.
By acceptance division 104 from base station control station 200 receive base station identifiers and tentative distribute newly establish station private downlink scrambler, newly establish station private downlink scrambler and in scrambling code setting portion 106, set.The control channel of the scrambler that sending part 102 utilization sets after by spread spectrum begins the transmission of base station identifiers.In addition, acceptance division 104 receives the permanent descending scrambler that is distributed by base station control station 200, and the station private downlink scrambler of newly establishing that scrambling code setting portion 106 will fix tentatively distribution is updated to permanent scrambler.
The structure of the base station control station 200 of present embodiment then, is described.
The base station control station 200 of present embodiment has: as the scrambler dispenser 202 of scrambling code setting unit; Peripheral cell list update portion 204; The storage part 206 that is connected with peripheral cell list update portion 204 with scrambler dispenser 202.
Scrambler dispenser 202 under the situation of newly having established base station 100, allocation base station identifier and tentative and permanent descending scrambler.
Peripheral cell list update portion 204 carries out the renewal of peripheral cell tabulation.Storage part 206 storage peripheral cell tabulations.
Then, with reference to Fig. 4 base station 100 under the situation of newly having established the base station and the handshaking between the base station control station 200 are described.
Newly establish base station 100 4With base station control station 200 1Physical connection is when energized, to base station control station 200 1Request allocation base station identifier and tentative scrambler (Sc) (step S402).Base station control station 200 1Scrambler dispenser 202 to the assignable base station identifiers of server interrogates, select at random from predefined newly the establishing the special-purpose scrambler in station of system, establish base station 100 to newly 4Give base station identifiers and tentative scrambler (step S404).Afterwards, newly establish base station 100 4Can transmit control channel, but, send the sign (step S406) of forbidding that mobile radio station connects in the shared control channel of all reporting chain information in sub-district.Therefore, though can receiving, mobile radio station newly establishes base station 100 4Control channel, identification base station identifiers and scrambler, but via newly establishing base station 100 4Connection (transceiver) be under an embargo.
Then, illustrate with reference to Fig. 5 and newly establish base station 100 4Just be assigned with the peripheral cell tabulation of each base station 100 behind base station identifiers and the tentative scrambler.
The peripheral cell tabulation is stored in the storage part 206 of base station control station 200 at each base station sets.The peripheral cell tabulation is the tabulation of having given priority of the identifier of the peripheral existing base station of base station and scrambler etc. of being correlated with, and the base station number that can set is for example 32 by system constraint.
Usually the peripheral cell tabulation is kept by base station control station 200, but also can remain in the storage part 108 of base station 100.
Established base station 100 1Peripheral cell tabulation in to have set scrambler be that Sc#a, base station identifiers are that base station and the scrambler of BSid#a is that Sc#b, base station identifiers are the base station of BSid#b, and to have put down in writing scrambler be that Sc#1, base station identifiers are this base station 100 of BSid#1 1
Established base station 100 2Peripheral cell tabulation in to have set scrambler be that Sc#3, base station identifiers are that base station and the scrambler of BSid#3 is that Sc#c, base station identifiers are the base station of BSid#c, and to have put down in writing scrambler be that Sc#2, base station identifiers are this base station 100 of BSid#2 2
Established base station 100 3Peripheral cell tabulation in to have set scrambler be that Sc#2, base station identifiers are that base station and the scrambler of BSid#2 is that Sc#d, base station identifiers are the base station of BSid#d, and to have put down in writing scrambler be that Sc#3, base station identifiers are this base station 100 of BSid#3 3
Newly establish base station 100 4Peripheral cell tabulation in put down in writing this base station 100 as initial condition 4Tentative scrambler Sc#tmp and base station identifiers BSid#new.
Then, illustrate down with reference to Fig. 6 and belong to and newly establish base station 100 4The adjacent base station 100 of establishing 1, 100 2With 100 3The mobile radio station 300 of formed sub-district 1, 300 2, 300 3With 300 4The situation of the measurement result of base station is newly established in report.
Under belong to and establish base station 100 1The mobile radio station MS300 of sub-district 1Be positioned to receive and newly establish base station 100 4The place of shared control channel, the common mensuration action by being used to detect handover etc. is to establishing base station 100 1 Base station 100 is newly established in report 4Base station identifiers, scrambler, incoming level etc.
Equally, mobile radio station MS300 2To establishing base station 100 2The report measurement result, mobile radio station MS300 3To establishing base station 100 3The report measurement result.But, because mobile radio station MS300 4Only belong to down and newly establish base station 100 4So, can not with circulated a notice of to be connected prohibitory sign newly establish base station 100 4Connect, do not report.By mobile radio station 300 1, 300 2With 300 3The measurement result of being reported is forwarded to upper base station control station 200 by each base station 100.
Like this, in the present embodiment, setting when newly establishing the scrambler of base station, the mobile radio station that belongs to the neighbor cell of newly establishing the base station down exists and newly establishes the base station to the base station circular of establishing that forms neighbor cell, selects the sign indicating number that can set according to these syntoples of storing in the base station control station.In addition, in order to make the reception high speed of the shared control channel of newly establishing the base station in the mobile radio station, also can in the peripheral cell tabulation of base station, jointly be set in the predefined special-purpose scrambler in station of newly establishing in the system.
Like this, when the scrambler of base station is newly established in setting, can carry out the ring of the detection of establishing the base station that forms neighbor cell, needn't make base station side have measurement function as the common mensuration action in the mobile radio station.This method detects syntople with newly establishing base station self by the existing base station that direct mensuration forms neighbor cell, selects the method difference of the sign indicating number that can set by their employed sign indicating numbers of identification.
In addition, carry out in the visuality mutual under the situation of detection of syntople according to the base station, even since may exist the base station each other visual but in the coverage the non-conterminous situation in sub-district, though perhaps opposite not visible in the coverage the adjacent situation in sub-district, so can not carry out the detection of correct syntople, may not be for newly establishing base station selected suitable scrambler.But, in the present embodiment, because carry out detecting, so do not have such problem by the syntople that mobile radio station is implemented based on the coverage.
Then, with reference to the structure of Fig. 7 A and Fig. 7 B explanation mobile radio station 300 with from the information (measure report) of mobile radio station 300 to base station 100 reports.
Mobile radio station 300 has scrambler and base station identifiers determination part 302 shown in Fig. 7 A.Scrambler and base station identifiers determination part 302 measured the base station identifiers, scrambler, incoming level of base stations 100 etc., and reports to and establish base station 100.
Though the scrambler of mobile radio station 300 and base station identifiers determination part 302 are also established base station 100 to newly 4Outside the information of the peripheral base station that can measure simultaneously of base station report, but here for convenience of description, only show and newly establish the base station.
Mobile radio station MS300 1, 300 2With 300 3Scrambler and base station identifiers determination part 302 shown in Fig. 7 B, with the base station 100 of newly establishing 4Tentative scrambler Sc#tmp and base station identifiers BSid#new send to base station 100 as measuring report 1, 100 2With 100 3Each base station 100 1, 100 2With 100 3The mensuration report that is sent is transferred to base station control station 200.
In addition, the scrambler of mobile radio station MS300 and base station identifiers determination part 302 can also be reported the time of advent difference of incoming level and control channel etc. except base station identifiers and scrambler.
Base station control station 200 is in scrambler dispenser 202, when include the mensuration report of having confirmed to pass on to come from base station 100 system's defined newly establish the tentative scrambler of base station special use the time, correspondingly upgrade the peripheral cell tabulation of newly establishing the base station, distribute permanent scrambler.
At first, each base station control station is according to newly establishing base station 100 4Base station identifiers infer and accommodate the base station control station of newly establishing the base station, with measuring report and passing on the peripheral cell tabulation of base station in source, transfer to and accommodate the base station control station of newly establishing the base station as one group.Fig. 8 shows each base station control station and transfers to the base station control station newly established under the base station, for example 200 1Information.At base station control station 200 1Scrambler dispenser 202 in, the peripheral cell tabulation of the adjacent base station that passed on synthesize to generate the peripheral cell of newly establishing the base station tabulates.
Fig. 9 show in scrambler dispenser 202 generate newly establish base station 100 4Peripheral cell tabulation.The scrambler and the base station identifiers of the adjacent base station that sends the peripheral cell tabulation on the highest order of the priority that peripheral cell is tabulated, have been put down in writing.The peripheral base station of record in the peripheral cell tabulation of having put down in writing on the position lower at adjacent base station than it.Here, preferably occurrence number is big more then upper more for priority.The scrambler and the base station identifiers of newly establishing the base station have been put down in writing at last.
Peripheral cell tabulation with reference to this stage then can overview already used scrambler in the peripheral base station of newly establishing the base station.Therefore, can at random be chosen in the peripheral cell tabulation non-existent scrambler as the permanent scrambler (Sc#new) of newly establishing the base station.Scrambler dispenser 202 is selected permanent scrambler, selected permanent scrambler is notified to newly establishes base station 100 4 Base station 100 4Scrambling code setting portion 106 will fix tentatively scrambler and be updated to permanent scrambler.
Here, because the base station number that can put down in writing in the peripheral cell tabulation is limited, if so the base station number of putting down in writing in the cell list after synthetic has surpassed the upper limit, then scrambler dispenser 202 keeps the item of this base station, the low item of deletion priority is selected the low permanent scrambler of being deleted of scrambler conduct of priority.Like this, determine newly to establish the permanent scrambler and the peripheral cell tabulation of base station.
Determined newly to establish base station 100 4Permanent scrambler after, carry out the renewal of the peripheral cell tabulation of adjacent base station.
Accommodate and newly establish base station 100 4Base station control station 200 1Scrambler dispenser 202 by sending at newly establishing base station 100 to accommodating 4The base station 100 of mensuration report 1～100 3Base station control station 200 1With 200 2Send peripheral cell list update request as shown in figure 10, notify the scrambler of newly establishing the base station, carry out the request of peripheral cell list update.
The peripheral cell list update portion 204 of base station control station 200 that has received the request of peripheral cell list update carries out the renewal of peripheral cell tabulation according to the request of peripheral cell list update.As a result, in the storage part 206 of each base station control station 200, in the tabulation of the peripheral cell of storage, the scrambler and the base station identifiers of newly establishing the base station for example on highest order, have been appended.
By finishing this processing, newly establish base station 100 4But become service state, remove the connection prohibitory sign of shared control channel, allow mobile radio station MS300 4Connection, become with to establish the base station identical.
Like this, in the present embodiment, when the scrambler of base station is newly established in setting, the scrambling code setting of peripheral cell tabulation and the renewal of peripheral cell tabulation have been considered.Under the situation of setting the scrambler newly establish the base station, not only need to avoid to use with form neighbor cell establish the identical sign indicating number in base station, also need to avoid using to have established the sign indicating number of being put down in writing in the peripheral cell tabulation of base station at these.If do not observe this regulation, then may between inferior adjacent sub-district (sub-district adjacent), use same scrambler with neighbor cell, because the peripheral cell tabulation of the base station of the sub-district in the middle of formation is arranged in them, can not register as adjacent base station 2 systematically that scrambler is identical base stations, do not become interference source in the system so there is a side's of registration base station not to be included into.Therefore, carry out the renewal of scrambling code setting and peripheral cell tabulation, can prevent the deterioration of power system capacity and communication quality by considering that peripheral base station is tabulated.
Then, with reference to Figure 11 explanation and the permanent scrambler of determining newly to establish the base station, carry out the handshaking between the relevant network inscape of the processing of the renewal that peripheral cell tabulates.
Newly establish base station 100 4The shared control channel (step S1102) that connects prohibitory sign has been set in transmission.Though under belong to and newly establish base station 100 4The mobile radio station MS300 of formed sub-district 4Can not receive and dispatch (step S1104), but belong to the adjacent base station 100 of establishing 1～100 3The sub-district, and, can receive and newly establish base station 100 4The mobile radio station MS300 of shared control channel 1～300 3 Base station 100 is newly established in identification 4Scrambler and base station identifiers, and to the affiliated base station 100 of establishing 1～100 3Report (step S1106, step S1110, step S1114).Established base station 100 1～100 3To the base station control station 200 of accommodating this base station 1With 200 2Pass on and measure report (step S1108, step S1112, step S1116).
Base station control station 200 2With measure report and pass on the peripheral cell tabulation of source base station, send to as one group accommodated according to base station identifiers detected come newly establish base station 100 4Base station control station 200 1(step S1118).
At base station control station 200 1Scrambler dispenser 202 in, generate and newly to establish base station 100 4Peripheral cell tabulation, and utilize this peripheral cell tabulation to determine that permanent scrambler makes and do not repeat (step S1120).In addition, the permanent scrambler that will newly determine of scrambler dispenser 202 is notified to and newly establishes base station 100 4(step S1122), and it is appended to the adjacent base station 100 of establishing 1With 100 2Peripheral cell tabulation in, to upgrade (step S1126).
In addition, base station control station 200 1Scrambler dispenser 202 to base station control station 200 2Send peripheral cell list update request (step S1124).Base station control station 200 2Established base station 100 3The renewal (step S1128) of peripheral cell tabulation, and to base station control station 200 1Report peripheral cell list update finishes (step S1130).
Then, base station control station 200 1Establish base station 100 to newly 4Send the order (step S1132) of the setting of removing the connection prohibitory sign of circulating a notice of by shared control channel.Newly establish base station 100 4The mobile radio station 300 that belongs to the formed sub-district of our station downwards 4Send the shared control channel (step S1134) that expression connects permission.As a result, belong under and newly establish base station 100 4The mobile radio station 300 of formed sub-district 4Can with newly establish base station 100 4Connect (step S1136).
Then, illustrate that with reference to Figure 12 deletion established the situation of base station.
At first, the base station 100 1, 100 2With 100 4By base station control station 200 1 Base station 100 is accommodated by institute 3By base station control station 200 2Institute accommodates.Afterwards, remove by base station control station 200 1The base station 100 of accommodating 4
Then, remove Signal Exchange Processing between the processing of base station, network inscape when carrying out this processing with reference to Figure 13 explanation.
When in base station to be removed 100 4Middle beginning base station removes when handling (step S1302), at first, sets connection prohibitory sign (step S1304) in shared control channel, forbids the connection (step S1306) of new mobile radio station.For example, belong to base station 100 under forbidding 4The mobile radio station MS300 of sub-district 4Connection.
Remove base station 100 4Wait for the end of conversation of the mobile radio station of communicating by letter, request base station control station 200 1Reclaim base station identifiers and permanent scrambler (step S1308).Base station control station 200 1Request has been accommodated in the base station 100 that is removed 4Peripheral cell tabulation in each base station control station of base station of record, for example base station control station 200 2, deletion removes base station 100 from the peripheral cell tabulation of this base station 4Item, upgrade (step S1310).Base station control station 200 2Deletion removes base station 100 from the peripheral cell tabulation 4Item, upgrade (step S1314).Then, base station control station 200 2To base station control station 200 1Represent the notice (step S1318) that the peripheral cell list update finishes.
On the other hand, base station control station 200 1Deletion removes base station 100 from the peripheral cell tabulation 4Item, upgrade (step S1312).Then, base station control station 200 1Delete the peripheral cell tabulation (step S1316) of the base station self that is removed in the base station control station.Figure 14 represents to delete the situation of the item that removes the base station from the peripheral cell tabulation.
When the renewal of peripheral cell tabulation finishes, accommodate and remove base station 100 4Base station control station 200 1To removing base station 100 4Circular has finished the recovery of base station identifiers, permanent scrambler, makes shared control channel stop (step S1320).
Remove base station 100 4After other the processing of being through with, cut off the electricity supply and finish the base station and remove processing (step S1322).
In the above-described embodiment, the upper situation that has base station control station in the base station has been described, but also can have carried out the function of base station control station dispersedly, in this case, not necessarily needed base station control station by each base station.
In addition, according to the foregoing description, to wanting to determine the tentative scrambler of base station sets of scrambler, the measurement result that the mobile radio station that belongs to neighbor cell is down carried out as moving usually focuses in the base station control station as the minizone syntople.And, form the peripheral cell tabulation of this base station automatically, upgrade the peripheral cell tabulation of peripheral base station automatically.Promptly, carrying out timing in automatic minute of descending scrambler, because use common mensuration report,, do not need to increase the scale of base station or software, antenna so do not need in the base station, to determine from the control channel of the downgoing line of peripheral base station transmission the existing method of picture from mobile radio station.
In addition, because when determining the scrambler that will distribute, considered the peripheral cell tabulation,, prevent to produce and disturb so use chance in can being suppressed at closely with a kind of scrambler.In addition, because suitably generate the peripheral cell tabulation simultaneously with the distribution of scrambler, so mobile radio station can carry out cell detection at high speed, the communication quality when having improved handover has reduced the interference that produces simultaneously, has increased power system capacity.
In addition, when removing the base station, reclaim scrambler, also deletion comprises the information that removes the base station from the peripheral cell tabulation of peripheral base station, so can repeat effectively to utilize scrambler, always can keep the cell detection action of the high speed of mobile radio station.
In addition, needn't the use a computer result of emulation of wireless network designer manually sets scrambler and peripheral cell tabulation, and because the mensuration of in the coverage of reality, carrying out according to mobile radio station report, so resetting of can not taking place that evaluated error that electric wave arrives the zone causes.This is needed time of save design, computer resource etc. significantly, we can say that effect is very big.
Base station of the present invention, mobile communication system and scrambling code setting method are applicable to the CDMA Cellular System of utilizing the code division multiple access access way to use identical frequency band in shared among users.

Claims (9)

1. the base station of a mobile communication system (100) in this mobile communication system, belong to a plurality of mobile radio stations (300) of neighbor cell and the shared band sharing in base station of the described neighbor cell of formation down and communicate, and it is characterized in that, comprising:
Scrambling code setting unit (106), it sets base station identifiers and the tentative tentative descending scrambler that distributes; And
Transmitting element (102), it uses described tentative scrambler that described base station identifiers is carried out spread spectrum, and sends described base station identifiers,
Wherein, the report relevant with the reception of described base station identifiers of described scrambling code setting unit basis distributes permanent descending scrambler.
2. base station according to claim 1 is characterized in that:
Described scrambling code setting unit distributes described permanent descending scrambler according to the described reception report that is sent to the base station of the described subordinate of mobile radio station institute in the adjacent base station by a mobile radio station in the described mobile radio station, and described adjacent base station is adjacent with described base station.
3. base station according to claim 1 and 2 is characterized in that:
Described transmitting element send be used to forbid mobile radio station set described tentative scrambler during the sign that is connected with described base station.
4. according to any described base station in the claim 1 to 3, it is characterized in that:
Described base station has neighbor cell list, and this neighbor cell list is represented the scrambler of a base station in the described adjacent base station adjacent with described base station, and
Described scrambling code setting unit distributes described permanent descending scrambler according to described neighbor cell list.
5. base station according to claim 4 is characterized in that, also comprises:
The neighbor cell list updating block, it upgrades described neighbor cell list.
6. base station according to claim 5 is characterized in that:
In the time will removing described base station, described scrambling code setting unit returns described descending scrambler and described base station identifiers,
Described neighbor cell list updating block upgrades described neighbor cell list according to returning of described descending scrambler.
7. the scrambling code setting method of a mobile communication system in this mobile communication system, belongs to a plurality of mobile radio stations of neighbor cell and the shared band sharing in base station of the described neighbor cell of formation down and communicates, and it is characterized in that, comprising:
Set the step of base station identifiers and the tentative tentative descending scrambler that distributes;
Transmission utilizes described tentative descending scrambler to carry out the step of the described base station identifiers behind the spread spectrum;
The step of distributing permanent descending scrambler according to the reception report of described base station identifiers; And
Set the step of the scrambler that is distributed.
8. scrambling code setting method according to claim 7 is characterized in that:
The described reception report that sends to described adjacent base station according to the following mobile radio station that belongs to adjacent base station in the described mobile radio station is carried out the step of the permanent descending scrambler of described distribution, and described adjacent base station is adjacent with described base station.
9. according to claim 7 or 8 described scrambling code setting methods, it is characterized in that:
Carry out the step of the permanent descending scrambler of described distribution according to the neighbor cell list of the scrambler of representing described adjacent base station.
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